Prism glass reflector for artificial lights.



O. A. MYGATT. PRISM GLASS REFLECTOR FOP ARTIFICIAL mums APPLICATION FILED JULY 1.1909,

Patented M1 L11":

AYYENTU.H,

' sT 'rEs nn rsn'ronn on '7 one A MYGATT, on NEW YORK,--N. r.

Prnssr GLASS REFLEc'ron FOR ARTIFICIAL 'I Jon rs.v

Specification of Letters Patent. PafientdD QC. 15; I914,

Application filed lluly 1', 1909 Serial No. 505,436.

Terril whom it maconcern:

.Be it known t .at-.I,'OrIs MY'GATT, a citizen of the vUnited States, residing at New- York, inthe county "o'ffNew York. and State of New York, have invented certain new 'and iist-jh l Improvements in Prism Glass Refleetorsfor Artificial Lights, of

which the following is 'a specification, refer-' ence being had therein to the accompanying V (ll'llfv'lr The invention coils in the following constrimtion and dispo ition ofthe prisms,

as w ll l e-more specificallydescribedin the cation and set forth the clz'ii'ms- Figu: 1. represents a pla n oftzr reflector embod ig myin 'entionJ F and 3 are phtn views illustriitiye-of furtherexemplilicetions of the in'rentionh' -Fig. 4 is a.

side elevation of a: modifiedforin t re hector. I

in Fig" 1 my invention 'isc i-rr ed out by proyiding one surface of'the-refictor with a series of prisms a 'ofeqiial width from the neck 0 to the outczredge [Between equal width prisms are disposed other prisms e which converge between; the sides of the equal width prisms-a.

.lu l ig. 2 the reflector sei panels (1 w;

is divided into a. which are dis el prisms h. The si rl'nce of the reflector in this example is -d into a himlit y of panels or 'sc-rles A. .llCli are pro 1th prisms h. In 3 tin :ctor is composed of a togigs of cou're -1Dg rudiiil pr sms k he z=n which are arranged a series of parsilv'i equal size prisms '21 in l -igi 4} the reflector is composed of an series of radial, panels meach of p 'm'ided with parallel prisms. inner portion of this shade is provided iin an :Vingulnr skirt having panels and prisms similar to those heretofore dcsci'ibci'l.

ln reflectors as previously constructed, and for the purposes of highest efiiciency their; are generally provided radially disposed prismatic douhle-rcllocting prisms,

' m n eds- M tive to vibrations when light weight prisms prisms the angles-of wind such prisms being'more efficie'nt than where horizontally disposed. Such radially arranged reflectors have been open to the serious-objection that the prisms have been radial converging prisms small and'narrow at the neck of the reflector:zindaccordingly increzising' in height and depth between the upper and lower edge o f'the reflector; jSuch construction is open to the-objectionthat the reflector becomes 'undul :hB'ili-Vy and 'ponderous owing to the increase in size and depth toward the outer edge A furtherobjection is that such prisms-.when exposed to heat contract and expend unequally to-" o SIiClLRli extent that the i-efiectorfis e-a'sil-y liableto fracture from thiitcause. A fur-' ther objection to such reflect rs is tl' 'et'jthe i heaviest part ofthe reflector-51s attthcyouter edgesof tliesu" 'i ne where the 'prisms' are rfefo'rfle"not.iiiell areik l ly' 'sensiA v :SKlS ended; from brackets andfelectroliers. a Byfthc use of, my p are broken up i it'o'mlarge nu'nihir d unced reflector 51in "one-I it rich csp ii swi y un e thereby rei'idering it pr fracture from .such zi- It shoi ild'be unde herein referredjsto er in rge,- and 'th'e reflector. h"

offsm'all 'th t thej prisms the neighborhood of the- By breaking up tl e iprism'at'ic surface of the reflector into dissimilar shaped prisms,

but having a common do u b lerefiecting power or forming the seine into z; plurality of panels for that purpose it 'reflectoris pro-e5 luced having all the herein described ad vantages of construction' und eflicicncyi it 15 not essential that-all of theprisrns he double-reflecting in churzicterjas'someof them may be curred and'somei diffusing and transmitting prisms.

I claim: j

1. A reflector havingupon .its outer su r-' face n seriesof" rudin'l 'doublereflecting prisms; extending-from the top to the bottom thereof and of substantially uniform width throughout their 'length. v r

2. rollcctoimh'ziring its i'luter-siufzice covered with radially extending double re fleeting prisms, certain of said prisms being of uniform width and extending from the top to the bottom of said reflector, and other en ti nth prisms 80 prisms fillingnthe spaces between the aforethroughout their iength,'and dther-series of mentioned prisms. V i ribs disposed singularly thereto. v

3. A rdfiectorhaving' upon its outer sur- In testimony whereof I aflix my signs.- '7 face a series of parallel double reflecting ture in presence of two witnesses. 5 prisms, certain of said prisms extendin I OTIS A. MYGATT. from the top to the bottomof seid'refl'ectqri- Witnesses? i 4. A reflector having. thereOn-aI-series .of JOEL-B LIBERMN, double-reflecting Enmzs'r P. RAY.

prisms, of u iiform width 

